Aluminum alloy sheet, method for producing the same, and aluminum alloy container

Abstract

An aluminum alloy sheet contains 0.1% to 0.4% by mass of Cu, 0.5% to 1.5% by mass of Mg, 0.5% to 1.5% by mass of Mn, 0.2% to 0.7% by mass of Fe, and 0.1% to 0.3% by mass of Si. The number density of Al—Mn—Fe—Si-based intermetallic compound having a maximum length of 8 to 15 μm per unit area is 179 grains/mm 2 or less. An oxide film having an average thickness of 30 nm or less is formed on the surface of the aluminum alloy sheet. The arithmetic average roughness Ra of the surface of the aluminum alloy sheet is 0.30 to 0.45 μm.

1. An aluminum alloy sheet comprising:
 0.1% to 0.4% by mass of Cu, 
 0.5% to 1.5% by mass of Mg, 
 0.7% to 1.5% by mass of Mn, 
 0.35% to 0.50% by mass of Fe, and 
 0.1% to 0.3% by mass of Si, wherein 
 a number density of Al—Mn—Fe—Si-based intermetallic compound having a maximum length of 8 to 15 μm per unit area is 179 grains/mm 2  or less; 
 a number density of Al—Mn—Fe—Si-based intermetallic compound having a maximum length of 10 μm or more per unit area is 67 grains/mm 2  or less; 
 an oxide film having an average thickness of 30 nm or less is formed on the surface of the aluminum alloy sheet; and 
 an arithmetic average roughness Ra of the surface of the aluminum alloy sheet is 0.30 to 0.45 μm. 
 
     
     
       2. An aluminum alloy container produced from an aluminum alloy sheet comprising:
 0.1% to 0.4% by mass of Cu, 
 0.5% to 1.5% by mass of Mg, 
 0.7% to 1.5% by mass of Mn, 
 0.35% to 0.50% by mass of Fe, and 
 0.1% to 0.3% by mass of Si, wherein 
 a number density of Al—Mn—Fe—Si-based intermetallic compound having a maximum length of 8 to 15 μm per unit area in the aluminum alloy sheet is 179 grains/mm 2  or less; 
 a number density of Al—Mn—Fe—Si-based intermetallic compound having a maximum length of 10 μm or more per unit area is 67 grains/mm 2  or less; 
 an oxide film having an average thickness of 30 nm or less is formed on the surface of the aluminum alloy sheet; and 
 an arithmetic average roughness Ra of the surface of the aluminum alloy sheet is 0.30 to 0.45 μm, 
 the aluminum alloy container having a cylindrical body portion and a neck portion formed by necking, wherein (D 1 −D 2 )/D 1 ×100≧30, wherein D 1  is the diameter of the body portion and D 2  is the diameter of the neck portion. 
 
     
     
       3. The aluminum alloy container according to  claim 2 , wherein an enamel rate value is 10 mA or less.